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TLC5947 ACTIVE

24-channel, 12-bit PWM LED driver with internal Oscillator

TLC5947 24-Channel, 12-Bit PWM LED Driver With Internal Oscillator datasheet (Rev. B) (pdf, 2.93 MB)

Parameters

Rating	Catalog
Approx. price(US$)	1.452 \| 1ku
Package size: mm2:W x L (PKG)	32HTSSOP: 68 mm2: 6.2 x 11 (HTSSOP\|32) 32VQFN: 25 mm2: 5 x 5 (VQFN\|32)
Package Group	HTSSOP\|32 VQFN\|32
Operating temperature range(C)	-40 to 85
Features	PWM control Thermal shutdown
Vin(Max)(V)	5.5
Vin(Min)(V)	3
LED current per channel(mA)	30
Number of channels(#)	24

Features & description

24 Channels, Constant-Current Sink Output
30-mA Capability (Constant-Current Sink)
12-Bit (4096 Steps) PWM Grayscale Control
LED Power-Supply Voltage Up to 30 V
V_CC = 3.0 V to 5.5 V
Constant-Current Accuracy:
- Channel-to-Channel = ±2% (Typical)
- Device-to-Device = ±2% (Typical)
CMOS Logic Level I/O
30-MHz Data Transfer Rate (Standalone)
15-MHz Data Transfer Rate (Cascaded Devices,
SCLK Duty = 50%)
Shift Out Data Changes With Falling Edge to
Avoid Data Shift Errors
Auto Display Repeat
4-MHz Internal Oscillator
Thermal Shutdown (TSD):
- Automatic Shutdown at OverTemperature Conditions
- Restart Under Normal Temperature
Noise Reduction:
- 4-Channel Grouped Delay to Prevent Inrush Current
Operating Temperature: –40°C to 85°C

The TLC5947 is a 24-channel, constant-current sink LED driver. Each channel is individually adjustable with 4096 pulse-width modulated (PWM) steps. PWM control is repeated automatically with the programmed grayscale (GS) data. GS data are written via a serial interface port. The current value of all 24 channels is set by a single external resistor.

The TLC5947 has a thermal shutdown (TSD) function that turns off all output drivers during an over-temperature condition. All of the output drivers automatically restart when the temperature returns to normal conditions.